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Start your free trialTroy Erby
6,332 PointsTrouble with Set Operations
Here is the challenge question:
There are two tables Fruit and Vegetable table. The Fruit table has a FruitID and a Name column and the Vegetable table has a VegetableID and Name column.
Create a list of all fruits and vegetables starting with the letters A through K . In other words all fruit and vegetables that don't start with the letter L to Z.
The code I used as an answer was:
SELECT name FROM fruit UNION SELECT name FROM vegetable WHERE name < "L"
The error message I got back is that my result did not return values for A-K
I apologize if this question is repetitive. I saw that another student posted the same question using the same line of code I did two days ago, but they didn't have a posted answer and I'm running into the same wall
1 Answer
Steven Parker
231,184 PointsYou're close, but the UNION
combines complete queries. So just as each one has a SELECT
clause and a FROM
, they each also need their own WHERE
clause.
Troy Erby
6,332 PointsTroy Erby
6,332 PointsWow! That did the trick. Thanks.
I could swear in the video Andrew distinctly said that only 1 WHERE clause was needed when using UNION statements but clearly using WHERE twice worked. Maybe I'm confusing it with a statement he made about JOIN functions. Either way, that you greatly for the help.
Steven Parker
231,184 PointsSteven Parker
231,184 PointsA "
JOIN
" is essentially an extension of the "FROM
" clause, so a query with one (or more) of them would still only need oneWHERE
.